硅烷偶联剂改性TiO2/膨胀石墨复合材料的制备及其光催化性能研究

以硅烷偶联剂黏结剂,利用溶胶-凝胶法将TiO2（P25）负载在膨胀石墨上,利用XRD、EDS以及SEM等分析技术对TiO2/膨胀石墨复合材料进行表征;以橙黄Ⅱ为目标降解物,考察了TiO2/膨胀石墨复合材料光催化性能以及重复使用性能。结果表明：随着TiO2含量的增加,TiO2/膨胀石墨复合材料的光催化效率随之增加,对橙黄Ⅱ的光催化降解符合一级反应动力学方程,TiO2负载量为15%时,反应速率常数为0.387 h-1,高于P25的反应速率常数。TiO2/膨胀石墨复合物使用4次仍保持较高的光催化活性。

Preparation and Photocatalytic Activities of TiO_2/Exfoliated Graphite Composites Modified by Using Silane Coupling Agent

TiO2 loaded on exfoliated Graphite photocatalysts were prepared by sol-gel technique with silane coupling agent as a binder.The photocatalysts were characterized by X-Ray diffraction(XRD),Scanning Electron Microscope(SEM) and Energy Dispersive X-ray Spectroscopy(EDS).Their photocatalytic activities and repeatability of the prepared photocatalysts were evaluated by photocatalytic decolorization of orange Ⅱ solution under UV light irradiation.The results indicate that the photocatalytic decolorization rate of orange Ⅱ solution increases with the increase of TiO2 loading content,and the photocatalytic degradation curves of orange Ⅱ follow first-order reaction kinetics.The reaction rate constant of the photocatalyst with 15% TiO2 loading content reaches to 0.387 h-1,and is higher than that of P25.The repeatability of photocatalytic activity was also tested,and the photocatalyst remained higher photocatalytic activity after four cycles use.